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Oral vitamins can be used to maintain the effect for longer time period

10.1021/ar800075n 193 MonnierL.ColetteC.MichelF.CristolJ.-P.OwensD

The authors concluded that oral collagen supplementation is effective in reducing wrinkles and enhancing skin elasticity and hydration, which was likely due to the promotion of extracellular matrix biosynthesis [54]

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doi: 10.1016/j.plaphy.2021.11.009 18 Gall.CzkusZ.BelaK.HorvthE.rdgA.CsiszrJ.et al

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